1, power washing. Use a pneumatic or electric brush to brush the dirt, and then the dirt is sucked into the vacuum collector in the same way and direction as the gas flush. Duct production line. This method requires as much care as possible to damage the surface of the insulation material.

2, gas rinse. This method utilizes a hose with a nozzle connected to the duct to deliver compressed air. The design of the nozzle allows the compressed air to expel dust and dirt. And the compressed air to dry the dirt and dust are transported along the duct into the vacuum container.

3, vacuum suction pollution. With a similar hand-held vacuum suction pipe to operate. Use a brush to directly contact the inner wall of the pipe to clean the dirt. This method requires a large manifold for the air duct to enable the operator to be able to get as much as possible. But this method may miss a portion of the dust and dirt, because the duct can not form a complete negative pressure conditions. Duct production line. The following methods can be used to form negative pressure bars